Cookware detection circuit and method and cooking equipment

Abstract

The invention relates to the technical field of cooking equipment, and discloses a cookware detection circuit, a cookware detection method and cooking equipment, the cookware detection circuit comprises a switching circuit, a cookware connection circuit, a temperature control circuit and a control circuit, the control circuit outputs a switching control signal to the switching circuit so as to control the on-off of the switching circuit, therefore, cooking equipment corresponding to the cookware detection circuit can be adjusted to be in a matched power supply state, and a target detection state can be determined through the control circuit according to a detected target voltage signal; the target detection state at least comprises a cookware connection state; the voltage value corresponding to the target voltage signal is determined by the first on-off state of the switching circuit, the second on-off state of the cookware connecting circuit and the third on-off state of the temperature control circuit. Therefore, the connection state of the cookware can be detected in different power supply states and circuit on-off states, so that the detection accuracy of the cookware is improved, and the use safety and reliability of the cooking equipment are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cooking equipment, and in particular to a cookware detection circuit, method and cooking equipment. Background Art

[0002] A multi-function cooking pot is a cooking device that integrates multiple cooking functions. It usually has multiple cooking modes such as frying, stir-frying, boiling, steaming, baking, and stewing. Because of its convenience and versatility, it is widely welcomed by household users.

[0003] However, in actual applications, it has been found that the pot recognition function of cooking devices currently on the market, such as multi-function cooking pots, is not perfect. For example, when the user lifts the pot during cooking, the cooking device cannot recognize in time that the pot has been removed, so the cooking device will still be in working condition, which may cause safety hazards; when the thermostat of the multi-function cooking pot is disconnected, the cooking device cannot determine whether the thermostat is faulty or the pot has been removed, resulting in the cooking device being unable to respond to the actual situation in a timely and accurate manner.

[0004] Therefore, it is particularly important to propose a technical solution that can improve the accuracy of pot detection, thereby improving the safety and reliability of cooking equipment, and improving the user experience of cooking equipment. Summary of the Invention

[0005] The present invention provides a cookware detection circuit, method and cooking device, which can improve the accuracy of cookware detection, thereby improving the safety and reliability of the cooking device and enhancing the user experience of the cooking device.

[0006] In order to solve the above technical problems, the first aspect of the present invention discloses a cookware detection circuit, which includes a switch circuit, a cookware connection circuit, a temperature control circuit and a control circuit, wherein: The first end of the switch circuit is used to electrically connect to the first wire of the power supply, the second end of the switch circuit is electrically connected to the first end of the cookware connection circuit and the first end of the control circuit respectively, the second end of the cookware connection circuit is electrically connected to the first end of the temperature control circuit, and the second end of the temperature control circuit is used to electrically connect to the second wire of the power supply; The control circuit is configured to output a switch control signal to the switch circuit; wherein the switch control signal is configured to control the switch circuit to be turned on / off, so that the cooking device corresponding to the pot detection circuit is in a power state that matches the switch control signal; The control circuit is further used to determine a target detection state based on the detected target voltage signal; the target detection state includes at least a cookware connection state, or the target detection state includes at least the cookware connection state and also includes a temperature control on-off state; wherein the voltage value corresponding to the target voltage signal is determined by the first on-off state of the switch circuit, the second on-off state of the cookware connection circuit, and the third on-off state of the temperature control circuit.

[0007] As an optional implementation, in the first aspect of the present invention, the switching circuit includes a switching device, wherein: The first end of the switch device is used to electrically connect to the first wire of the power supply, and the second end of the switch device is electrically connected to the first end of the cookware connection circuit and the first end of the control circuit respectively.

[0008] As an optional implementation, in the first aspect of the present invention, the temperature control circuit includes a temperature controller and an auxiliary detection module, wherein: The first end of the thermostat and the first end of the auxiliary detection module are respectively electrically connected to the second end of the cookware connection circuit, and the second end of the thermostat and the second end of the auxiliary detection module are respectively used to electrically connect to the second wire of the power supply; The thermostat is configured to disconnect the branch where the thermostat is located when detecting that the cookware detection circuit meets a preset circuit protection condition; The auxiliary detection module is used to form a path when the branch where the temperature controller is located is disconnected, so as to assist the control circuit in detecting the voltage signal corresponding to the third on-off state of the temperature control circuit.

[0009] As an optional embodiment, in the first aspect of the present invention, the cookware detection circuit further includes a signal processing circuit, wherein: The first end of the signal processing circuit is electrically connected to the second end of the switch circuit and the first end of the cookware connection circuit respectively, and the second end of the signal processing circuit is electrically connected to the first end of the control circuit; The signal processing circuit is used to adjust the voltage signal required to be input to the control circuit so as to output a target voltage signal to the control circuit; the target voltage signal is a voltage signal that meets the preset signal input condition corresponding to the control circuit.

[0010] As an optional implementation, in the first aspect of the present invention, the signal processing circuit includes a voltage divider module, wherein: The first end of the voltage divider module is electrically connected to the second end of the switch circuit and the first end of the cookware connection circuit respectively, the second end of the voltage divider module is electrically connected to the first end of the control circuit, and the third end of the voltage divider module is used for grounding; The voltage dividing module is used to perform voltage dividing processing on the voltage signal to obtain a target voltage signal.

[0011] As an optional embodiment, in the first aspect of the present invention, the voltage dividing module includes a first voltage dividing unit and a second voltage dividing unit, wherein: The first end of the first voltage divider unit is electrically connected to the second end of the switch circuit and the first end of the pot connection circuit respectively, the second end of the first voltage divider unit is electrically connected to the first end of the second voltage divider unit and the first end of the control circuit respectively, and the second end of the second voltage divider unit is used for grounding.

[0012] As an optional implementation, in the first aspect of the present invention, the signal processing circuit further includes a signal conditioning module, wherein: The first end of the signal conditioning module is electrically connected to the second end of the first voltage divider unit, the second end of the signal conditioning module is electrically connected to the first end of the second voltage divider unit and the first end of the control circuit respectively, and the third end of the signal conditioning module is used for grounding; The signal conditioning module is used to shape the target voltage signal to output the shaped target voltage signal to the control circuit.

[0013] As an optional implementation, in the first aspect of the present invention, the signal conditioning module includes a protection unit and a rectification unit, wherein: The first end of the protection unit is electrically connected to the second end of the first voltage divider unit and the first end of the rectifier unit respectively, and the second end of the protection unit is used for grounding; the second end of the rectifier unit is electrically connected to the first end of the second voltage divider unit and the first end of the control circuit respectively.

[0014] A second aspect of the present invention discloses a cookware detection method, the method being applied to a cookware detection circuit, wherein the cookware detection circuit includes a switch circuit, a cookware connection circuit, a temperature control circuit, and a control circuit, wherein: a first end of the switch circuit is used to electrically connect to a first wire of a power supply, a second end of the switch circuit is electrically connected to the first end of the cookware connection circuit and the first end of the control circuit, respectively, a second end of the cookware connection circuit is electrically connected to the first end of the temperature control circuit, and a second end of the temperature control circuit is used to electrically connect to a second wire of the power supply; The method comprises: The control circuit outputs a switch control signal to the switch circuit; wherein the switch control signal is used to control the switch circuit to be turned on / off, so that the cooking device corresponding to the pot detection circuit is in a power state matching the switch control signal; The control circuit determines a target detection state based on the detected target voltage signal; the target detection state includes at least a cookware connection state, or the target detection state includes at least the cookware connection state and also includes a temperature control on-off state; wherein the voltage value corresponding to the target voltage signal is determined by the first on-off state of the switch circuit, the second on-off state of the cookware connection circuit, and the third on-off state of the temperature control circuit.

[0015] A third aspect of the present invention discloses an electronic device, comprising a device body and any one of the pot detection circuits disclosed in the first aspect.

[0016] Compared with the prior art, the present invention has the following beneficial effects: In the present invention, the pot detection circuit includes a switch circuit, a pot connection circuit, a temperature control circuit and a control circuit, wherein: the first end of the switch circuit is used to electrically connect to the first wire of the power supply, the second end of the switch circuit is electrically connected to the first end of the pot connection circuit and the first end of the control circuit respectively, the second end of the pot connection circuit is electrically connected to the first end of the temperature control circuit, and the second end of the temperature control circuit is used to electrically connect to the second wire of the power supply; the control circuit is used to output a switch control signal to the switch circuit; wherein the switch control signal is used to control the on / off of the switch circuit so that the cooking device corresponding to the pot detection circuit is in a power state matching the switch control signal; the control circuit is also used to determine the target detection state based on the detected target voltage signal; the target detection state at least includes the pot connection state, or the target detection state at least includes the pot connection state and also includes the temperature control on-off state; wherein the voltage value corresponding to the target voltage signal is determined by the first on-off state of the switch circuit, the second on-off state of the pot connection circuit and the third on-off state of the temperature control circuit. It can be seen that the present invention provides a cookware detection circuit with a simple structure and easy implementation. By providing a switch circuit, a cookware connection circuit, a temperature control circuit, and a control circuit, the control circuit can output a switch control signal to the switch circuit to control the switch circuit to be on and off and to place the cooking device corresponding to the cookware detection circuit in a power state matching the switch control signal. The control circuit also determines the cookware connection state and the temperature control on / off state based on a detected target voltage signal determined based on the first on / off state of the switch circuit, the second on / off state of the cookware connection circuit, and the third on / off state of the temperature control circuit. This enables detection of the cookware connection state under different power states and circuit on / off states. More specifically, the cookware connection state can still be detected even when the temperature control is tripped, thereby improving the accuracy and flexibility of cookware detection. This is conducive to controlling the cooking device to take correct treatment measures in a timely manner according to different cookware connection states and temperature control on / off states, thereby improving the safety and reliability of the cooking device and enhancing the user experience of the cooking device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 This is a schematic structural diagram of a cookware detection circuit disclosed in an embodiment of the present invention; Figure 2 It is a structural diagram of another cookware detection circuit disclosed in an embodiment of the present invention; Figure 3 This is a structural diagram of another cookware detection circuit disclosed in an embodiment of the present invention; Figure 4 This is a structural diagram of another cookware detection circuit disclosed in an embodiment of the present invention; Figure 5 This is a flow chart of a cookware detection method disclosed in an embodiment of the present invention. Figure 6 It is a structural schematic diagram of a cooking device disclosed in an embodiment of the present invention. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0020] It should be noted that, unless otherwise expressly specified and limited, the term "electrical connection" in the specification and claims of the present invention and the above-mentioned drawings should be understood in a broad sense. For example, it can be a fixed electrical connection, a detachable electrical connection, or an integral electrical connection; it can be a mechanical electrical connection, an electrical electrical connection, or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, or it can be internal communication between two elements or an interactive relationship between two elements. In addition, the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. The terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] Example 1 See also Figure 1 , Figure 1 This is a schematic diagram of the structure of a pot detection circuit disclosed in an embodiment of the present invention. The circuit can be applied to a cooking device, wherein the cooking device may include a detachable pot and a body that matches the pot; optionally, the pot and the body may be connected by a connector (such as a connector), which is not limited in the embodiment of the present invention; optionally, the cooking device may be a multifunctional cooking device, and illustratively, the multifunctional cooking device may be a multifunctional cooking pot, which is not limited in the embodiment of the present invention. Figure 1 As shown, the cookware detection circuit 10 may include a switch circuit 101, a cookware connection circuit 102, a temperature control circuit 103 and a control circuit 104, wherein: A first end of the switch circuit 101 is electrically connected to a first wire of a power supply, a second end of the switch circuit 101 is electrically connected to a first end of the cookware connection circuit 102 and a first end of the control circuit 104, a second end of the cookware connection circuit 102 is electrically connected to a first end of the temperature control circuit 103, and a second end of the temperature control circuit 103 is electrically connected to a second wire of the power supply; The control circuit 104 is configured to output a switch control signal to the switch circuit 101; wherein the switch control signal is configured to control the switch circuit 101 to be turned on / off, so that the cooking device corresponding to the pot detection circuit is in a power state that matches the switch control signal; The control circuit 104 is further configured to determine a target detection state based on the detected target voltage signal; the target detection state includes at least a pot connection state, or the target detection state includes at least a pot connection state and also includes a temperature control on-off state; wherein the voltage value corresponding to the target voltage signal is determined by the first on-off state of the switch circuit 101, the second on-off state of the pot connection circuit 102, and the third on-off state of the temperature control circuit 103.

[0022] Optionally, the first conductor of the power supply may be a live wire (L), and the second conductor of the power supply may be a neutral wire (N); further optional, please refer to Figure 4 , Figure 4 FIG. 1 is a structural diagram of another cookware detection circuit disclosed in an embodiment of the present invention, such as Figure 4 As shown, the low-voltage DC power supply (VCC) can be the same line as the live line, which is not limited in the embodiment of the present invention; further optionally, the above-mentioned line can be a non-isolated power supply, which is not limited in the embodiment of the present invention.

[0023] Optionally, the power state may include a standby state or a working state; when the cooking device is in the working state, the cooking device may perform a heating operation on the pot to achieve a cooking function.

[0024] Optionally, the pot connection circuit 102 can be used to connect to a heating tube connected to the pot, wherein the heating tube is riveted to the pot, that is, when the pot connection circuit 102 is connected to the heating tube connected to the pot, the pot is connected to the body; Figure 4 As shown, when the cookware connection circuit 102 is connected to the heating element RL connected to the cookware, the first end of the heating element RL is electrically connected to the second end of the switch circuit 101, and the second end of the heating element RL is electrically connected to the first end of the temperature control circuit 103.

[0025] Optionally, the cookware connection status may include a cookware connected status or a cookware removed status; wherein the cookware connected status is used to indicate that the cookware has been connected, and the cookware removed status is used to indicate that the cookware has been removed.

[0026] Optionally, the temperature-controlled on-off state may include a temperature-controlled on-state or a temperature-controlled off-state.

[0027] Among them, optional, such as Figure 4 As shown, the control circuit 104 may include a single chip microcomputer, or may include other components with control and signal detection functions, which is not limited in the embodiment of the present invention.

[0028] It should be noted that, since the resistance of the access circuit is different in the first on-off state of the switch circuit 101, the second on-off state of the cookware connection circuit 102, and the third on-off state of the temperature control circuit 103, the target voltage signal detected by the control circuit is different.

[0029] As can be seen, the embodiments of the present invention provide a cookware detection circuit with a simple structure and easy implementation. By providing a switch circuit, a cookware connection circuit, a temperature control circuit, and a control circuit, the control circuit can output a switch control signal to the switch circuit to control the switch circuit to be on and off and to place the cooking device corresponding to the cookware detection circuit in a power state matching the switch control signal. The control circuit also determines the cookware connection state and the temperature control on / off state based on a detected target voltage signal determined based on the first on / off state of the switch circuit, the second on / off state of the cookware connection circuit, and the third on / off state of the temperature control circuit. This allows the cookware connection state to be detected under different power states and circuit on / off states. More specifically, the cookware connection state can still be detected even when the temperature control is tripped, thereby improving the accuracy and flexibility of cookware detection. This facilitates controlling the cooking device to take timely and correct treatment measures based on different cookware connection states and temperature control on / off states, thereby improving the safety and reliability of the cooking device and enhancing the user experience of the cooking device.

[0030] In an optional embodiment, if Figure 4 As shown, the switch circuit 101 may include a switch device TR, wherein: A first end of the switch device TR is used to electrically connect to a first wire of a power supply, and a second end of the switch device TR is electrically connected to a first end of the cookware connection circuit 102 and a first end of the control circuit 104 respectively.

[0031] Among them, if the switching device TR is in the off state after receiving the switching control signal output by the control circuit 104, the first on-off state corresponding to the switching circuit 101 is the off state; if the switching device TR is in the on state after receiving the above-mentioned switching control signal, the first on-off state corresponding to the switching circuit 101 is the on state.

[0032] Optionally, the switching device may be a semiconductor switching device, more specifically a thyristor. The switching device may also be any other component capable of performing the same switching control function as a semiconductor switching device, and the present invention is not limited thereto. By using a semiconductor switching device, the on / off state of the switching circuit can be more accurately controlled, enabling more precise and reliable power control of the cooking device.

[0033] It can be seen that this optional embodiment can improve the on-off control efficiency and convenience of the switching circuit while constructing a switching circuit with a simple structure by providing a switching device in the switching circuit.

[0034] In an optional embodiment, if Figure 3 As shown, the temperature control circuit 103 may include a temperature controller 1031 and an auxiliary detection module 1032, wherein: The first end of the thermostat 1031 and the first end of the auxiliary detection module 1032 are respectively electrically connected to the second end of the cookware connection circuit 102, and the second end of the thermostat 1031 and the second end of the auxiliary detection module 1032 are respectively used to electrically connect to the second wire of the power supply; Thermostat 1031 is used to disconnect the branch where thermostat 1031 is located when it detects that the pot detection circuit meets the pre-set circuit protection condition; The auxiliary detection module 1032 is used to form a path when the branch where the thermostat 1031 is located is disconnected, so as to assist the control circuit 104 in detecting the voltage signal corresponding to the third on-off state of the temperature control circuit 103 .

[0035] Among them, optionally, detecting whether the pot detection circuit meets the preset circuit protection conditions can be specifically: when it is detected that the temperature value detected by the thermostat 1031 is higher than the preset temperature value, or when it is detected that there is a fault in the pot detection circuit, it is determined that the pot detection circuit meets the preset circuit protection conditions.

[0036] Optional, such as Figure 4 As shown, the thermostat 1031 can be Figure 4 In the thermostat K1 shown, the auxiliary detection module 1032 may include an auxiliary detection resistor R3, wherein: The first end of the thermostat K1 and the first end of the auxiliary detection resistor R3 are respectively electrically connected to the second end of the cookware connection circuit 102, and the second end of the thermostat K1 and the second end of the auxiliary detection resistor R3 are respectively used to electrically connect to the second wire of the power supply.

[0037] In this way, by providing an auxiliary detection resistor in the auxiliary detection module, the auxiliary detection function can be realized efficiently and at a low cost.

[0038] It can be seen that this optional embodiment, by arranging a thermostat in the temperature control circuit, can efficiently and accurately disconnect the branch where the thermostat is located when it is detected that the circuit needs to take emergency circuit protection measures, thereby improving the safety and reliability of circuit use and helping to reduce the risk of safety accidents; and, by arranging an auxiliary detection module in the temperature control circuit, can form a path through the auxiliary detection module when the branch where the thermostat is located is disconnected, so that the control circuit can intelligently determine the temperature control on-off status based on the voltage difference between the two situations where the path is formed by the thermostat and the path is formed by the auxiliary detection module, thereby improving the detection flexibility of the temperature control on-off status; and because a path can still be formed through the auxiliary detection module when the branch where the thermostat is located is disconnected, it is possible to detect the connection status of the cookware when the thermostat is disconnected, which is conducive to further improving the detection accuracy and detection flexibility of the cookware connection status.

[0039] In an optional embodiment, if Figure 2 As shown, the cookware detection circuit 10 may further include a signal processing circuit 105, wherein: The first end of the signal processing circuit 105 is electrically connected to the second end of the switch circuit 101 and the first end of the cookware connection circuit 102, respectively. The second end of the signal processing circuit 105 is electrically connected to the first end of the control circuit 104. The signal processing circuit 105 is used to adjust the voltage signal required to be input to the control circuit 104 to output a target voltage signal to the control circuit 104 ; the target voltage signal is a voltage signal that meets the preset signal input condition corresponding to the control circuit 104 .

[0040] It can be seen that this optional embodiment can output a voltage signal that meets the preset signal input conditions to the control circuit by setting a signal processing circuit in the pot detection circuit, which is beneficial to improving the processing accuracy of the voltage signal, thereby helping the control circuit to more accurately determine the target detection status based on the precise voltage signal.

[0041] In this optional embodiment, optionally, as Figure 3As shown, the signal processing circuit 105 may include a voltage dividing module 1051, wherein: A first end of the voltage divider module 1051 is electrically connected to the second end of the switch circuit 101 and the first end of the cookware connection circuit 102, respectively. A second end of the voltage divider module 1051 is electrically connected to the first end of the control circuit 104. A third end of the voltage divider module 1051 is grounded. The voltage dividing module 1051 is used to perform voltage dividing processing on the voltage signal to obtain a target voltage signal.

[0042] It can be seen that by setting up a voltage divider module in the signal processing circuit, the voltage signal can be divided, so that the voltage input to the control circuit can be reduced proportionally, avoiding damage to the control circuit due to excessive voltage, which is beneficial to improving the processing accuracy of the voltage signal while improving the safety and reliability of the circuit.

[0043] In this optional embodiment, optionally, as Figure 3 As shown, the voltage dividing module 1051 may include a first voltage dividing unit 10511 and a second voltage dividing unit 10512, wherein: The first end of the first voltage divider unit 10511 is electrically connected to the second end of the switch circuit 101 and the first end of the cookware connection circuit 102, respectively. The second end of the first voltage divider unit 10511 is electrically connected to the first end of the second voltage divider unit 10512 and the first end of the control circuit 104, respectively. The second end of the second voltage divider unit 10512 is used for grounding.

[0044] It can be seen that by setting the first voltage dividing unit and the second voltage dividing unit in the voltage dividing module, the voltage dividing function can be realized more accurately, which is conducive to further improving the processing accuracy of the voltage signal, and further conducive to more accurately adjusting the voltage input to the control circuit.

[0045] In this optional embodiment, optionally, as Figure 3 As shown, the signal processing circuit 105 may further include a signal conditioning module 1052, wherein: A first terminal of the signal conditioning module 1052 is electrically connected to a second terminal of the first voltage divider unit 10511 , a second terminal of the signal conditioning module 1052 is electrically connected to a first terminal of the second voltage divider unit 10512 and a first terminal of the control circuit 104 , and a third terminal of the signal conditioning module 1052 is grounded. The signal conditioning module 1052 is configured to shape the target voltage signal and output the shaped target voltage signal to the control circuit 104 .

[0046] It can be seen that by adding a signal conditioning module to the signal processing circuit, the voltage signal can be shaped, thereby improving the stability, accuracy and reliability of the voltage signal input to the control circuit, which is conducive to enabling the control circuit to more accurately determine the target detection status based on the precise voltage signal.

[0047] In this optional embodiment, the signal conditioning module 1052 optionally includes a protection unit 10521 and a rectification unit 10522, wherein: The first end of the protection unit 10521 is electrically connected to the second end of the first voltage divider unit 10511 and the first end of the rectifier unit 10522, respectively, and the second end of the protection unit 10521 is used for grounding; the second end of the rectifier unit 10522 is electrically connected to the first end of the second voltage divider unit 10512 and the first end of the control circuit 104, respectively.

[0048] It can be seen that by setting a protection unit and a rectification unit in the signal conditioning module, the rectification function and the protection function can be realized, thereby improving the reliability of signal transmission and circuit safety, which is conducive to enabling the control circuit to more accurately determine the target detection status based on the precise voltage signal.

[0049] In this optional embodiment, optionally, as Figure 4 As shown, the first voltage dividing unit 10511 may include a first voltage dividing resistor R1 and a second voltage dividing resistor R2, the protection unit 10521 may include a first diode D1, and the rectifier unit 10522 may include a second diode D2, wherein: The first end of the first voltage-dividing resistor R1 is electrically connected to the second end of the switch circuit 101 and the first end of the cookware connection circuit 102, respectively. The second end of the first voltage-dividing resistor R1 is electrically connected to the cathode of the first diode D1 and the anode of the second diode D2, respectively. The anode of the first diode D1 is used for grounding. The cathode of the second diode D2 is electrically connected to the first end of the second voltage-dividing resistor R2 and the first end of the control circuit 104, respectively. The second end of the second voltage-dividing resistor R2 is used for grounding.

[0050] It can be seen that by setting resistors in the voltage divider unit and diodes in the protection unit and the rectification unit, it is possible to efficiently and conveniently realize the voltage divider function, the rectification function, and the protection function while constructing a signal processing circuit with a simple structure, thereby reducing the circuit development cost while improving the signal processing efficiency.

[0051] Combine Figure 4 The circuit structure shown in FIG. 1 is a circuit diagram of a cookware detection circuit according to an embodiment of the present invention. The working principle of the cookware detection circuit is as follows: 1. When the switch control signal sent by the single chip microcomputer is used to control the cooking device to be in standby state, the thyristor TR is disconnected, and the target voltage signal detected by the pot detection circuit can be divided into the following situations: (1) The cookware has been connected to the machine body (that is, the heating element RL has been connected to the cookware detection circuit), and the thermostat K1 is normally closed. Since the live wire L is connected to the power supply VCC, the current of the neutral wire N will flow through the thermostat K1, the heating element RL, the first voltage divider resistor R1, the second diode D2, the second voltage divider resistor R2 and finally return to the live wire L. At this time, the pin voltage of the single-chip microcomputer is equivalent to: the internal resistance of the heating element RL + the voltage divided by the first voltage divider resistor R1 and the second voltage divider resistor R2, that is, the voltage value corresponding to the above target voltage signal is xV; (2) The pot is removed (i.e., the heating element RL is not connected to the pot detection circuit), and the thermostat K1 is normally closed, i.e., the heating element RL is equivalent to an open circuit, and the circuit between terminal 1 and terminal 2 is broken. At this time, the pin voltage of the microcontroller is equivalent to the voltage of the second voltage divider resistor R2, that is, the voltage value corresponding to the above target voltage signal is 0V; (3) The cooker is connected to the main unit, but the thermostat K1 is tripped (i.e., the thermostat K1 is disconnected). The current in the neutral line N will flow through the auxiliary detection resistor R, the heating element RL, the first voltage divider resistor R1, the second diode D2, the second voltage divider resistor R2, and finally return to the live line L. At this time, the pin voltage of the microcontroller is equivalent to: the auxiliary detection resistor R3 + the internal resistance of the heating element RL + the voltage divided by the first voltage divider resistor R1 and the second voltage divider resistor R2, and the voltage value is x1V. (4) The pot is removed, but the thermostat K1 trips, and the RL heating element is equivalent to an open circuit, that is, the heating element RL is equivalent to an open circuit, and there is a break between terminal 1 and terminal 2. At this time, the pin voltage of the microcontroller is equivalent to: the voltage of the second voltage divider resistor R2, that is, the voltage value corresponding to the above target voltage signal is 0V.

[0052] 2. When the switch control signal sent by the single chip microcomputer is used to control the cooking device to be in working state, the thyristor TR is turned on, and the target voltage signal detected by the pot detection circuit can be divided into the following situations: (1) The cooker has been connected to the machine body, and the thermostat K1 is normally closed. Because the live wire L is connected to the power supply VCC, the current of the live wire L will flow through the heating element RL, the thermostat K1 and the neutral wire N. At this time, the pin voltage of the single-chip microcomputer is equivalent to: the internal resistance of the heating element RL + the voltage divided by the first voltage divider resistor R1 and the second voltage divider resistor R2, that is, the voltage value corresponding to the above target voltage signal is xV; (2) The pot is removed and the thermostat K1 is normally closed, that is, the heating element RL is equivalent to an open circuit, and the circuit between terminal 1 and terminal 2 is broken. At this time, the pin voltage of the microcontroller is equivalent to the voltage of the second voltage divider resistor R2, that is, the voltage value corresponding to the above target voltage signal is 0V; (3) The cooker is connected to the machine body, but the thermostat K1 is tripped. The current of the neutral line N will flow through the auxiliary detection resistor R3, the heating element RL, the first voltage divider resistor R1, the second diode D2, the second voltage divider resistor R2 and finally return to the live line L. At this time, the pin voltage of the single-chip microcomputer is equivalent to: the auxiliary detection resistor R3 + the internal resistance of the heating element RL + the voltage divided by the first voltage divider resistor R1 and the second voltage divider resistor R2, and the voltage value is x1V; (4) The pot is removed, but the thermostat K1 trips, which means that the heating element RL is equivalent to an open circuit, and there is a break between terminal 1 and terminal 2. At this time, the pin voltage of the microcontroller is equivalent to the voltage of the second voltage divider resistor R2, that is, the voltage value corresponding to the above target voltage signal is 0V.

[0053] In summary, when the detected voltage value is xV, it can be determined that the cookware is connected and the thermostat is normally closed; when the detected voltage value is x1V, it can be determined that the cookware is connected and the thermostat is tripped; when the detected voltage value is 0V, it can be determined that the cookware is removed.

[0054] Example 2 See also Figure 5 , Figure 5 This is a flow chart of a cookware detection method disclosed in an embodiment of the present application. Figure 5 The described pot detection method can be applied to a pot detection circuit, which may include a switch circuit, a pot connection circuit, a temperature control circuit, and a control circuit, wherein: the first end of the switch circuit is used to electrically connect to the first wire of the power supply, the second end of the switch circuit is electrically connected to the first end of the pot connection circuit and the first end of the control circuit respectively, the second end of the pot connection circuit is electrically connected to the first end of the temperature control circuit, and the second end of the temperature control circuit is used to electrically connect to the second wire of the power supply. Figure 5 As shown, the cookware detection method may include the following operations: 201. The control circuit outputs a switch control signal to the switch circuit.

[0055] In the embodiment of the present invention, the switch control signal is used to control the switching circuit to be turned on / off, so that the cooking device corresponding to the pot detection circuit is in a power state matching the switch control signal.

[0056] 202. The control circuit determines a target detection state according to the detected target voltage signal.

[0057] In an embodiment of the present invention, the target detection state includes at least the cookware connection state, or the target detection state includes at least the cookware connection state and also includes the temperature control on-off state; wherein, the voltage value corresponding to the target voltage signal is determined by the first on-off state of the switching circuit, the second on-off state of the cookware connection circuit and the third on-off state of the temperature control circuit.

[0058] It can be seen that the method described in the embodiment of the present invention can output a switch control signal to the switch circuit through the control circuit to control the on and off of the switch circuit and put the cooking device corresponding to the pot detection circuit into a power state matching the switch control signal. The control circuit can also determine the pot connection state and the temperature control on and off state based on the detected target voltage signal determined based on the first on and off state of the switch circuit, the second on and off state of the pot connection circuit, and the third on and off state of the temperature control circuit, thereby achieving the ability to detect the connection state of the pot in different power states and circuit on and off states. More specifically, the connection state of the pot can still be detected even when the temperature control is tripped, thereby improving the accuracy and flexibility of pot detection, and further facilitating the control of the cooking device to take correct treatment measures in a timely manner according to different pot connection states and temperature control on and off states, thereby improving the safety and reliability of the cooking device and improving the user experience of the cooking device.

[0059] Example 3 See also Figure 6 , Figure 6 This is a schematic diagram of the structure of a cooking device disclosed in an embodiment of the present invention. The cooking device includes any of the pot detection circuits described in Example 1. The cooking device can implement functions including, but not limited to, detecting the pot connection status regardless of power supply status and circuit on / off status. It should be noted that for a detailed description of the pot detection circuit, please refer to the relevant description in Example 1 and will not be repeated in this embodiment.

[0060] It can be seen that implementation Figure 6 The described cooking device can be based on a pot detection circuit with a simple structure and easy implementation. By providing a switch circuit, a pot connection circuit, a temperature control circuit and a control circuit, the control circuit can output a switch control signal to the switch circuit to control the switching circuit to be on and off and to put the cooking device corresponding to the pot detection circuit into a power state matching the switch control signal. The control circuit can also determine the pot connection state and the temperature control on-off state based on a target voltage signal detected and determined based on a first on-off state of the switch circuit, a second on-off state of the pot connection circuit and a third on-off state of the temperature control circuit, thereby achieving detection of the pot connection state in different power states and circuit on-off states. More specifically, the pot connection state can still be detected even when the temperature control is tripped, thereby improving the accuracy and flexibility of pot detection, and facilitating the cooking device to take correct treatment measures in a timely manner according to different pot connection states and temperature control on-off states, thereby improving the safety and reliability of the cooking device and enhancing the user experience of the cooking device.

[0061] Finally, it should be noted that the cookware detection circuit, method, and cooking device disclosed in the embodiments of the present invention are only preferred embodiments of the present invention and are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, it should be understood by those skilled in the art that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A cookware detection circuit, characterized in that: The pot detection circuit includes a switch circuit, a pot connection circuit, a temperature control circuit and a control circuit, wherein: The first end of the switch circuit is used to electrically connect to the first wire of the power supply, the second end of the switch circuit is electrically connected to the first end of the cookware connection circuit and the first end of the control circuit respectively, the second end of the cookware connection circuit is electrically connected to the first end of the temperature control circuit, and the second end of the temperature control circuit is used to electrically connect to the second wire of the power supply; The control circuit is configured to output a switch control signal to the switch circuit; wherein the switch control signal is configured to control the switch circuit to be turned on / off, so that the cooking device corresponding to the pot detection circuit is in a power state that matches the switch control signal; The control circuit is further used to determine a target detection state based on the detected target voltage signal; the target detection state includes at least a cookware connection state, or the target detection state includes at least the cookware connection state and also includes a temperature control on-off state; wherein the voltage value corresponding to the target voltage signal is determined by the first on-off state of the switch circuit, the second on-off state of the cookware connection circuit, and the third on-off state of the temperature control circuit.

2. The cookware detection circuit according to claim 1, characterized in that: The switching circuit includes a switching device, wherein: The first end of the switch device is used to electrically connect to the first wire of the power supply, and the second end of the switch device is electrically connected to the first end of the cookware connection circuit and the first end of the control circuit respectively.

3. The cookware detection circuit according to claim 1, characterized in that: The temperature control circuit includes a temperature controller and an auxiliary detection module, wherein: The first end of the thermostat and the first end of the auxiliary detection module are respectively electrically connected to the second end of the cookware connection circuit, and the second end of the thermostat and the second end of the auxiliary detection module are respectively used to electrically connect to the second wire of the power supply; The thermostat is configured to disconnect the branch where the thermostat is located when detecting that the cookware detection circuit meets a preset circuit protection condition; The auxiliary detection module is used to form a path when the branch where the temperature controller is located is disconnected, so as to assist the control circuit in detecting the voltage signal corresponding to the third on-off state of the temperature control circuit.

4. The cookware detection circuit according to any one of claims 1 to 3, characterized in that: The cookware detection circuit further includes a signal processing circuit, wherein: The first end of the signal processing circuit is electrically connected to the second end of the switch circuit and the first end of the cookware connection circuit respectively, and the second end of the signal processing circuit is electrically connected to the first end of the control circuit; The signal processing circuit is used to adjust the voltage signal required to be input to the control circuit so as to output a target voltage signal to the control circuit; the target voltage signal is a voltage signal that meets the preset signal input condition corresponding to the control circuit.

5. The cookware detection circuit according to claim 4, characterized in that: The signal processing circuit includes a voltage divider module, wherein: The first end of the voltage divider module is electrically connected to the second end of the switch circuit and the first end of the cookware connection circuit respectively, the second end of the voltage divider module is electrically connected to the first end of the control circuit, and the third end of the voltage divider module is used for grounding; The voltage dividing module is used to perform voltage dividing processing on the voltage signal to obtain a target voltage signal.

6. The cookware detection circuit according to claim 5, characterized in that: The voltage dividing module includes a first voltage dividing unit and a second voltage dividing unit, wherein: The first end of the first voltage divider unit is electrically connected to the second end of the switch circuit and the first end of the pot connection circuit respectively, the second end of the first voltage divider unit is electrically connected to the first end of the second voltage divider unit and the first end of the control circuit respectively, and the second end of the second voltage divider unit is used for grounding.

7. The cookware detection circuit according to claim 6, characterized in that: The signal processing circuit further includes a signal conditioning module, wherein: The first end of the signal conditioning module is electrically connected to the second end of the first voltage divider unit, the second end of the signal conditioning module is electrically connected to the first end of the second voltage divider unit and the first end of the control circuit respectively, and the third end of the signal conditioning module is used for grounding; The signal conditioning module is used to shape the target voltage signal to output the shaped target voltage signal to the control circuit.

8. The cookware detection circuit according to claim 7, characterized in that: The signal conditioning module includes a protection unit and a rectification unit, wherein: The first end of the protection unit is electrically connected to the second end of the first voltage divider unit and the first end of the rectifier unit respectively, and the second end of the protection unit is used for grounding; the second end of the rectifier unit is electrically connected to the first end of the second voltage divider unit and the first end of the control circuit respectively.

9. A method for detecting a cookware, characterized in that: The method is applied to a cookware detection circuit, and the cookware detection circuit includes a switch circuit, a cookware connection circuit, a temperature control circuit, and a control circuit, wherein: a first end of the switch circuit is used to electrically connect to a first wire of a power supply, a second end of the switch circuit is electrically connected to the first end of the cookware connection circuit and the first end of the control circuit, respectively, a second end of the cookware connection circuit is electrically connected to the first end of the temperature control circuit, and a second end of the temperature control circuit is used to electrically connect to a second wire of the power supply; The method comprises: The control circuit outputs a switch control signal to the switch circuit; wherein the switch control signal is used to control the switch circuit to be turned on / off, so that the cooking device corresponding to the pot detection circuit is in a power state matching the switch control signal; The control circuit determines a target detection state based on the detected target voltage signal; the target detection state includes at least a cookware connection state, or the target detection state includes at least the cookware connection state and also includes a temperature control on-off state; wherein the voltage value corresponding to the target voltage signal is determined by the first on-off state of the switch circuit, the second on-off state of the cookware connection circuit, and the third on-off state of the temperature control circuit.

10. A cooking device, characterized in that: The cooking device includes a device body and a pot detection circuit according to any one of claims 1 to 8.

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